Level 3 Service Manual
GALAXY ASTRAL GEO GEO WAP
Mitsubishi Electric Telecom Europe SA
Version E
ZA le Piquet, 35370 Etrelles
Date: 04/00
Phone: +33 2 99 75 71 00
Fax: + 33 2 99 75 71 47
5/29
2. Battery management.
2.1 Block Diagram.
2.
2 Description.
The battery is NiMH 900mAh, 3.8 V nominal for Galaxy, Astral and Geo
External power supply for charging (EXPS) comes from the DC jack at the bottom side of the mobile
(AC/DC, CLA, DTC or H/F Kit). This power supply is 5.8 V nominal. Battery presence and battery
type information are accessible in CHGM IPD register. If a Li-ion battery is detect, the software
considers that the battery is absent.
The battery temperature information (TH) is given by thresholds in IPD CHGM register. This
information are used only for charge control.
The battery level information is accessible in an A/D converter in One-C. It is also available in CHGM
IPD register , these information are given by range only for range control.
External power supply (EXPS) presence information are accessible in CHGD IPD register. As
described in the drawing above, the power supply for Base Band (IC300) comes from EXPS when it is
present because EXPS level (5.8 V) is always greater than battery voltage. On the contrary, power
supply for radio always comes from the battery.
The serial diode between battery and One-C (IC300) can be bypassed by software to reduce voltage
headroom. Bypass is Activated when battery is less than 3.45 V.
Base Band
IPD
charger
EXPS:
AC/DC
CLA
DTC
HF kit
+
NIMH
900mAh
RADIO
thermistor
TH
SPI interface
I charge
5,8V
nominal
Green led
Red led
CHGERR
One-C
AUX_IN0
BLEV
BYPASS
GPIO9
GPIO10
3,8V
nominal
IPD
regulators
regulators